1. Hengyang People\’s Hospital: Address: No. 118, Shifu Road, Zhuhui District, Hengyang City, Hunan Province, Tel: 0734-84333032. Hengyang Maternal and Child Health Hospital, Hunan Province: Address: No. 82, Renmin Road, Zhengxiang District, Hengyang City, Hunan Province, Tel: 0734-84531693. Hengyang Central Hospital, Hunan Province